Abstract
A laminated structure of Cr-Cu coating was produced by electroplating on a carbon steel substrate. Two baths of chromium and copper electrolyte solutions were prepared to respectively deposit Cr and Cu as the first and second layer. The Cr was plated using the same plating time of 60 minutes, whereas Cu was deposit using plating time of 1 hour, 1.5 hours, 2 hours, 3 hours and 3.5 hours. The effect of plating time on the thickness, hardness and specific wear rate of the Cu surface was investigated. The formed phase, thickness, hardness and specific wear rate of the Cu surface were observed using XRD, optical microscope, Vickers microhardness tester and Ogoshi wear rate tester, respectively. The results show that Cu was formed on the surface. An increase of the Cu plating time increased the thickness and the specific wear rate of the Cu surface, but reduced the hardness of Cu surface. Cu layer was observed denser than that of Cr. This study showed that the use of Cu can be a potential candidate to laminate Cr for use in corrosive environment. Keywords
Highlights
IntroductionHard chromium coatings have long been considered as the most used electrodeposited coatings in several industrial applications such as in petro chemistry, oil and gas industries
Hard chromium coatings have long been considered as the most used electrodeposited coatings in several industrial applications such as in petro chemistry, oil and gas industries. This is due to the advantageous properties of chromium coatings such as high hardness, low coefficient of friction, high wear and corrosion resistance [1, 2]
The formation of Cu layer in the upper layer was confirmed by XRD test
Summary
Hard chromium coatings have long been considered as the most used electrodeposited coatings in several industrial applications such as in petro chemistry, oil and gas industries. This is due to the advantageous properties of chromium coatings such as high hardness, low coefficient of friction, high wear and corrosion resistance [1, 2]. Under a maximum shearing stress, a scratch can develop into void or deep crack which subsequently cause a spalling of the coating parts. These damages are unacceptable for component used in corrosive environment since it can lead to the degradation of the mechanical properties of the base metal [5]. Copper is a soft metal which has attracted many attentions for use as under or upper layer of the hard chromium coatings
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